Watch



Feb. 3, 1942. H ACQ-1- GUYO-r 2,271,593

WATCH Filed July 31, 1939 5 Sheets-Sheet l Feb. 3, 1942. H. JAcoT GUYOT2,271,593

' WATCH Filed July 31, 1939 3 Sheets-Sheet 2 .27a/@pg 540255.40/ @af 3Sheets-Sheet 5 Zhi/f I fcJCo Feb. 3, 1942. H JAcoT GUYOT WATCH FlledJuly 31 1939 Patented Feb. 3, 1942 WATCH Henri Jacot Guyot, Neuchatel,Switzerland, as-

signor to the firm Ebauches S. A., Neuchatel, Switzerland, a firm ofSwitzerland Application July 31, 1939, Serial No. 287,633 In SwitzerlandAugust 15, 1938 3 Claims.

This invention relates to watches, and more particularly stated, tochronograph movements of the type comprising at least one hammer foreiecting the resetting to Zero of the chronograph indicating means, anda lever carrying an intermediate wheel which is constantly in gear withone of the watch movement wheels and which for starting the chronographis put into gear with the chronograph wheel carrying the seconds hand.

The object of the present invention is the provision of a chronographmovement of the abovementioned type, wherein an oscillatable tappet isprovided of which said hammer forms a substantial part and which isadapted to operate said wheel carrying lever.

Another object of the invention is the provision of manipulating organsto which said pivoted tappet is subjected for effecting the starting andstopping of the chronograph mechanism and the resetting to zero of thechronograph indicating means. q

A still further object is the'provision of means adapted to maintainsaid pivoted tappet automatically in the working position and the stopposition of the chronograph mechanism, as well as in the position ofrest for the resetting to zero of the chronograph indicating meansrespectively.

Other objects of the invention will become apparent as the specicationproceeds.

In the drawings:

The Figures l, 2 and 3 concern a rst embodiment of the invention.

Figure 1 is a plan view showing the chronograph mechanism in workingposition.

Figures 2 and 3 are two plan views drawn to a smaller scale, showing thechronograph mechanism in other positions.

Figures 4, 5 and 6 are three similar views of a second embodiment, andFigures 7, 8 and 9 illustrate a third embodiment of the invention.

I is the center wheel of the chronograph mechanism carrying the secondshand in the center, and 2 is the minutes counter wheel, these two wheelsbeing kinematically related by a mechanism of the type described in theSwiss Patent No. 197,349, and which will here not be described indetails. A driving wheel 3 is mounted on the axle of and above theordinary seconds wheel of the watch movement and constantly meshes withan intermediate wheel 4. The latter is carried by a rocking lever 5pivoted at 6 and acted upon by a spring 1 tending to constantly displacesaid lever so as to bring the intermediate wheel 4 into gear with thecenter wheel I.

8 is an oscillatable tappet pivoted at its center and formed integralwith a two branched hammer 9 which is adapted to act upon the heartcamsI0 and II carried by the wheels I and 2, respectively, for resetting thecounter hands to zero. This tappet is provided with an U-shaped notch8', a series of V-notches 20 and an eccentric projection I2 disposedside by side on its circumference and at approximately the same distancefrom its center. The projection I2 c0- operates with a plane face I3 ofthe lever 5. The oscillatable tappet is operated by a rocking lever I4pivoted at I5 on the watch frame and which is shown having a rounded endengaging the U- shaped notch 8 of said tappet. The lever I4 is itselfsubjected to the operation of three pushers I6, II and I8. A spring pawlI9 is also provided to cooperate with the V-notches 28 of the tappet soas to maintain the latter in the desired one of different position.

In Figure 1 the pusher I6 is pressed down and brings the tappet 8 intothe working position shown in this gure, whereby the wheel 4 is put intogear with the wheel I by the spring 1, so that the chronograph mechanismis set to Work. When the pusher II is pressed down, the tappet 8 ismoved by the lever I4 into the stop position shown in Fig. 2, while thepusher I6 is pushed back into its position of rest. The projection I2 ofthe tappet thereby acts upon the lever 5 to release the wheel 4 fromengagement with the wheel I, and the chronograph mechanism is thus 'vstopped. For the resetting to zerov of the hands the pusher I8 has to bepressed down; the tappet 8 is then moved by the lever I4 to assume theposition of rest shown in Fig. 3 where the twobranched haminer isapplied against the heart shaped cams I0 and II, while wheel 4 remainsdisengaged from Wheel I. In this moment the pawl I9 ceases to cooperatewith one of the notches 20 of the tappet and rests on a plane surface ofsaid tappet. The tappet 8 under the action of spring 1 providedconsequently returns to the stop position shown in Fig. 2 as soon as thepusher I8 be set free, and will be held in this position owing to therenewed intermeshing of pawl I9 and one of the notches 2D. Whenactuating again the pusher I6 to obtain the forward movement, saidpusher will cause the various organs to move from the stop position ofFig. 2 to the working position shown in Fig. 1.

The embodiment shown in Figures 4 to 6 differs from the preceding one inthat the pivoted hammer or tappet 28 is directly operated by two pushers2| and 22 provided on either side of the winding crown. This tappet 28is therefore disposed immediately below this crown. The pusher 2l bearswith the head of a screw 2|a against said tappet, Whereas the inner endof the pusher 22 is pivoted on this tappet at a point 23 which issymmetrical to the point 2h. with respect to the axis of rotation 24 ofthe tappet 23.

In Figure 4 the pusher 22 is pressed down and the chronograph mechanismis thereby put into gear. If the pusher 2l is pressed down the variousorgans move into the stop position shown in Fig. 5. If, at last, thepusher 22 is drawn back by means of the button 22a, the positionobtained corresponds to the resetting to Zero, as shown in Fig. 6,whereby the hammer which is a single one, acts upon the heart shaped camof the center Wheel of the chronograph.

In the embodiment illustrated in Figures 7 to 9 the rocking lever 5pivoted at 5 is subjected to the action of a spring 31, and theoscillatable tappet 38 is again formed integral with a two branchedhammer 9 and operated by a rocking lever 3ft pivoted at 35 and operableby three pushers It,

I1, I8 as has been described relative to Figs. l to 3. However, the saidembodiment differs from the first embodiment shown in that theoscillatable tappet 38 presents three V-notches 25, 26 and 21cooperating with the spring pawl 39. Figure 'l shows the workingposition of the chronograph mechanism, the tappet 33 being `maintainedautomatically in this position by the pawl 39 engaging the notch 25. InFigure 8, the pawl 39 engages the notch 26 to hold the tappet in thestop position while in Figure 9 said pawl engages the notch 2l for theresetting to zero of the hands. In this way the hammer 9 remains incontact with the heart shaped resetting cams as long as the seconds handis at zero, so as to maintain said hand and the minutes counter.

hand perfectly stationary.

I claim:

1. Chronograph mechanism having in combination a seconds wheel, adriving wheel mounted on the axle of and above said seconds wheel, acounter wheel provided with a heart-cam, an oscillatable tappet pivotedin its center and having an U-shaped notch, a series of V-notches and aprojection which are disposed side by side on the circumference of saidtappet and at approximately the same distance from the center thereof,said tappet forming also a bent extension terminating in a resettinghammer adapted to act upon the heart-cam of said counter wheel, anoperable rst rocking lever having a substantially rounded end engagingsaid U-shaped notch in the tappet for oscillating the same, a springpressed second rocking lever pivot-ed at one end and being applied atits other end against said projection on the tappet, an intermediatewheel carried by said second lever, said wheel being constantly in gearwith said driving wheel and adapted to be brought into gear with saidcounter Wheel upon rocking said second lever by means of said tappet,and a spring pawl adapted to engage said V-notches in the tappet formaintaining said tappet in determined positions.

2. Chronograph mechanism having in combination a seconds wheel, adriving Wheel mounted on the axle of and above said seconds wheel, aseconds counter wheel and a minutes counter wheel each provided with aheart-cam and being kinematically connected to each other, anoscillatable tappet pivoted in its center and having an U-shaped notch,a series of V-notches and a projection which are disposed side by sideon the circumference of said tappet and at approximately the samedistance from the center thereof, said tappet forming also a bentextension terminating in a two-branched resetting hammer adapted to actupon the heart-cams of said counter wheels, an operable first rockinglever having a substationally rounded end engaging said U-shaped notchin the tappet for oscillating the same, a spring pressed second rockinglever p-ivoted at one end and being applied at its other end againstsaid projection on the tappet, an intermediate wheel carried by saidsecond lever, said wheel being constantly in gear with said drivingwheel and adapted to be brought into gear with the seconds counter wheelupon rocking said second lever by means of said tappet, and a springpawl adapted to engage said V-notches in the tappet for maintaining saidtappet in determined positions.

Chronograph mechanism having in combination a seconds wheel, a drivingwheel mounted on. the axle of and above said seconds wheel, a counterWheel provided with a heartcam, an oscillatable tappet pivoted in itscenter and having an U-shaped notch, a series of V-notches and aprojection which are disposed side by side on the circumference of saidtappet and at approximately the saine distance from the center thereof,said tappet forming also a bent extension terminating in a resettinghammer adapted to act upon the heart cam of said counter wheel, anoperable first rocking lever having a substantially rounded end engagingsaid U-shaped notch in the tappet for oscillating the same, a springpressed second rocking lever pivoted at one end and being applied at itsother end against said projection on the tappet, an

- intermediate wheel carried by said second lever,

said wheel being constantly in gear with said driving wheel and adaptedto be brought into gear with said counter wheel upon rocking said secondlever by means of said tappet, push buttons acting upon the firstrocking lever to successively oscillate said tappet by means of saidlever into three determined positions according as to start operation ofthe chronograph mechanism, to stop said mechanism, or to restore thecounter wheel to zero by means of said hammer, and a spring pawl adaptedto engage said V-notches in the tappet for maintaining the same in saidthree determined positions, substantially as specified.

HENRI JACOT GUYOT.

